Charred remains of a flatbread baked about 14,500 years ago in a stone fireplace at a site in northeastern Jordan have given researchers a delectable surprise: people began making bread, a vital staple food, millennia before they developed agriculture.

The discovery detailed on Monday shows that hunter-gatherers in the Eastern Mediterranean achieved the cultural milestone of bread-making far earlier than previously suspected, more than 4,000 years before plant cultivation took root.

The flatbread, likely unleavened and somewhat resembling pita bread, was fashioned from wild cereals such as barley, einkorn or oats, as well as tubers from an aquatic papyrus relative, that had been ground into flour.

It was made by a culture called the Natufians, who had begun to embrace a sedentary rather than nomadic lifestyle, and was found at a Black Desert archaeological site.

"The presence of bread at a site of this age is exceptional," said Amaia Arranz-Otaegui, a University of Copenhagen postdoctoral researcher in archaeobotany and lead author of the research published in the journal Proceedings of the National Academy of Sciences.

Arranz-Otaegui said until now, the origins of bread had been associated with early farming societies that cultivated cereals and legumes. The previous oldest evidence of bread came from a 9,100-year-old site in Turkey.

"We now have to assess whether there was a relationship between bread production and the origins of agriculture," Arranz-Otaegui said. "It is possible that bread may have provided an incentive for people to take up plant cultivation and farming if it became a desirable or much-sought-after food."

University of Copenhagen archaeologist and study co-author Tobias Richter pointed to the nutritional implications of adding bread to the diet.

"Bread provides us with an important source of carbohydrates and nutrients, including B vitamins, iron and magnesium, as well as fibre," Richter said.

Abundant evidence from the site indicated the Natufians had a meat- and plant-based diet. The round floor fireplaces, made from flat basalt stones and measuring about a metre in diameter, were located in the middle of huts.